Assessment of drinking water quality and rural household water treatment in Balaka District, Malawi

Abstract

Access to drinking water from unsafe sources is widespread amongst communities in rural areas such as Balaka District in Malawi. This situation puts many individuals and communities at risk of waterborne diseases despite some households adopting household water treatment to improve the quality of the water. However, there still remains data gaps regarding the quality of drinking water from such sources and the household water treatment methods used to improve public health. This study was, therefore, conducted to help bridge the knowledge gap by evaluating drinking water quality and adoption rate of household water treatment and storage (HWTS) practices in Nkaya, Balaka District. Water samples were collected from eleven systematically selected sites and analyzed for physico-chemical and microbiological parameters: pH, TDS, electrical conductivity (EC), turbidity, F−, Cl−, NO3−, Na, K, Fe, Faecal Coliform (FC) and Faecal Streptococcus (FS) bacteria using standard methods. The mean results were compared to the World Health Organization (WHO) and Malawi Bureau of Standards (MBS) (MS 733:2005) to ascertain the water quality for drinking purposes. A total of 204 randomly selected households were interviewed to determine their access to drinking water, water quality perception and HWTS among others. The majority of households (72%, n = 83) in Njerenje accessed water from shallow wells and rivers whilst in Phimbi boreholes were commonly used. Several households (>95%, n = 204) were observed to be practicing HWST techniques by boiling or chlorination and water storage in closed containers. The levels of pH (7.10–7.64), F− (0.89–1.46 mg/L), Cl− (5.45–89.84 mg/L), NO3− (0–0.16 mg/L), Na (20–490 mg/L), K (2.40–14 mg/L) and Fe (0.10–0.40 mg/L) for most sites were within the standard limits. The EC (358–2220 μS/cm), turbidity (0.54–14.60 NTU), FC (0–56 cfu/100 mL) and FS (0–120 cfu/100 mL) - mainly in shallow wells, were found to be above the WHO and MBS water quality specifications. The majority of the water samples (73%, n = 11) were classified as of “Intermediate risk” (FC 11–100 cfu/100 mL), hence not suitable for human consumption without prior treatment. This calls for large scale adoption of HWTS and continued monitoring of the water sources used in the study areas.